docs: def _process_pubmed_ids(pubmed_ids):
          """
          Take a list of pubmed IDs and add PMID prefix
          Args:
              :param pubmed_ids -  string representing publication
                                   ids seperated by a | symbol
          Returns:
              :return list: Pubmed curies
  
          """
          if pubmed_ids.strip() == '':
              id_list = []
          else:
              id_list = pubmed_ids.split('|')
          for (i, val) in enumerate(id_list):
              id_list[i] = 'PMID:' + val
          return id_list